正则表达式 匹配换行 的内容

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我们在用正则表达式分析html或者是xml的时候，会碰上要匹配的目标字符串含有回车换行的情况，这时候我们就不能试用

.*?来匹配了（除非你先把字符串中的回车换行去掉。）我们应该试用/s/S来匹配。

代码如下：

#!/usr/bin/env python
#coding=utf-8
import re
test = """
<target name="reviewcode" description="Review code using PMD">
  <taskdef name="pmd" classname="net.sourceforge.pmd.ant.PMDTask" 
  classpath="${lib.dir}/pmd-3.8.jar" />
    <pmd shortFilenames="true">
	<!-- Determine the ruleset to be used -->
	<ruleset>rulesets/favorites.xml</ruleset>
	<ruleset>basic</ruleset>
    <ruleset>
    
    asdaas
    
        abcde
    </ruleset>
	<!-- Generate and HTML report into the designated directory -->
	<formatter type="html" 
toFile="${report.dir}/pmd_automated_code_review_report.html" />
	<!-- Files to be configured for review -->
	<fileset dir="${workspace.dir}/">
	<!-- Include all .java files except those under directories that are 
	   automatically generated -->
	<include name="**/*.java" />
	<!-- A sample exlusion directory that has generated java source code -->
	<exclude name="**/generated/**/*.java" />
	</fileset>
	</pmd>
</target>

"""
if __name__ == '__main__':
    theDates = re.findall('''<ruleset>([/s/S]*?)</ruleset>''', test)   
    print theDates

输出结果：

> "D:/Python25/python.exe" -u "C:/test.py"
['rulesets/favorites.xml', 'basic', '/n /n asdaas/n /n abcde/n ']